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crypto: x86/aegis128 - take advantage of block-aligned len

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Update a caller of aegis128_aesni_ad() to round down the length to a
block boundary.  After that, aegis128_aesni_ad(), aegis128_aesni_enc(),
and aegis128_aesni_dec() are only passed whole blocks.  Update the
assembly code to take advantage of that, which eliminates some unneeded
instructions.  For aegis128_aesni_enc() and aegis128_aesni_dec(), the
length is also always nonzero, so stop checking for zero length.

Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2024-10-16 17:00:49 -07:00 committed by Herbert Xu
parent 933e897431
commit a0927a03e7
2 changed files with 17 additions and 24 deletions
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37
arch/x86/crypto/aegis128-aesni-asm.S
View File

@ -190,6 +190,8 @@ SYM_FUNC_END(aegis128_aesni_init)
/*
* void aegis128_aesni_ad(struct aegis_state *state, const u8 *data,
* unsigned int len);
*
* len must be a multiple of 16.
*/
SYM_FUNC_START(aegis128_aesni_ad)
.set STATEP, %rdi
@ -197,8 +199,8 @@ SYM_FUNC_START(aegis128_aesni_ad)
.set LEN, %edx
FRAME_BEGIN
cmp $0x10, LEN
jb .Lad_out
test LEN, LEN
jz .Lad_out
/* load the state: */
movdqu 0x00(STATEP), STATE0
@ -213,36 +215,31 @@ SYM_FUNC_START(aegis128_aesni_ad)
aegis128_update
pxor MSG, STATE4
sub $0x10, LEN
cmp $0x10, LEN
jl .Lad_out_1
jz .Lad_out_1
movdqu 0x10(SRC), MSG
aegis128_update
pxor MSG, STATE3
sub $0x10, LEN
cmp $0x10, LEN
jl .Lad_out_2
jz .Lad_out_2
movdqu 0x20(SRC), MSG
aegis128_update
pxor MSG, STATE2
sub $0x10, LEN
cmp $0x10, LEN
jl .Lad_out_3
jz .Lad_out_3
movdqu 0x30(SRC), MSG
aegis128_update
pxor MSG, STATE1
sub $0x10, LEN
cmp $0x10, LEN
jl .Lad_out_4
jz .Lad_out_4
movdqu 0x40(SRC), MSG
aegis128_update
pxor MSG, STATE0
sub $0x10, LEN
cmp $0x10, LEN
jl .Lad_out_0
jz .Lad_out_0
add $0x50, SRC
jmp .Lad_loop
@ -312,13 +309,14 @@ SYM_FUNC_END(aegis128_aesni_ad)
pxor MSG, \s4
sub $0x10, LEN
cmp $0x10, LEN
jl .Lenc_out_\i
jz .Lenc_out_\i
.endm
/*
* void aegis128_aesni_enc(struct aegis_state *state, const u8 *src, u8 *dst,
* unsigned int len);
*
* len must be nonzero and a multiple of 16.
*/
SYM_FUNC_START(aegis128_aesni_enc)
.set STATEP, %rdi
@ -327,9 +325,6 @@ SYM_FUNC_START(aegis128_aesni_enc)
.set LEN, %ecx
FRAME_BEGIN
cmp $0x10, LEN
jb .Lenc_out
/* load the state: */
movdqu 0x00(STATEP), STATE0
movdqu 0x10(STATEP), STATE1
@ -459,13 +454,14 @@ SYM_FUNC_END(aegis128_aesni_enc_tail)
pxor MSG, \s4
sub $0x10, LEN
cmp $0x10, LEN
jl .Ldec_out_\i
jz .Ldec_out_\i
.endm
/*
* void aegis128_aesni_dec(struct aegis_state *state, const u8 *src, u8 *dst,
* unsigned int len);
*
* len must be nonzero and a multiple of 16.
*/
SYM_FUNC_START(aegis128_aesni_dec)
.set STATEP, %rdi
@ -474,9 +470,6 @@ SYM_FUNC_START(aegis128_aesni_dec)
.set LEN, %ecx
FRAME_BEGIN
cmp $0x10, LEN
jb .Ldec_out
/* load the state: */
movdqu 0x00(STATEP), STATE0
movdqu 0x10(STATEP), STATE1

4
arch/x86/crypto/aegis128-aesni-glue.c
View File

@ -87,8 +87,8 @@ static void crypto_aegis128_aesni_process_ad(
src += fill;
}
aegis128_aesni_ad(state, src, left);
aegis128_aesni_ad(state, src,
left & ~(AEGIS128_BLOCK_SIZE - 1));
src += left & ~(AEGIS128_BLOCK_SIZE - 1);
left &= AEGIS128_BLOCK_SIZE - 1;
}